#down {
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
}

#down>span{
    display: inline-block;
    margin: 0 10px;
    height: 10px;
    width: 10px;
    border-radius: 50%;
}

#down>.max {
    height: 20px;
    width: 20px;
}